Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "sceaga." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 695.
, an; m. A shaw, small wood, copse, thicket. The word is found in many local names, and was preserved in various dialects, e. g. shaw a small shady wood in a valley, E. D. S. Pub. B. 7 (West Riding): a wood that encompasses a close, B. 16 (Sussex). Shaws broad belts of underwood, two, three, and even four rods wide, around every field, Farming words, 4 (Sussex). Shaw a natural copse of wood, Cumberland. The word occurs in the following passages of charters :-- Juxta silvam quam dicunt Toccansceaga, Cod. Dip. Kmbl. i. 121, 24.